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Many of you know Renntech from the Mercedes tuning world. They continue to expand their offering for other platforms including BMW. Below is a dyno graph from Renntech's S65 V8 software. The vehicle is a 2008 6 speed manual E90 M3 with 78,000 miles and a high flow cat. It was run on a hot Florida day in STD correction. Gains are 25 wheel horsepower at peak with just a tune only on pump gas from the baseline. The gains are throughout the entire curve, solid results from Renntech.

I love seeing more and more people start offering tunes for the S65B40. Those are some very big gains across the board!

Not that I doubt Renntech's ability as tuners, but I would have liked to see multiple baseline runs on the dyno. From what I've seen and understand, it takes quite a few runs to get a consistent and proper baseline run on the DynoJet for our cars. Often times, I see the first dyno run being the absolute lowest. Then again, maybe Renntech just renamed their highest baseline pull?

I love seeing more and more people start offering tunes for the S65B40. Those are some very big gains across the board!

Not that I doubt Renntech's ability as tuners, but I would have liked to see multiple baseline runs on the dyno. From what I've seen and understand, it takes quite a few runs to get a consistent and proper baseline run on the DynoJet for our cars. Often times, I see the first dyno run being the absolute lowest. Then again, maybe Renntech just renamed their highest baseline pull?

They likely did do multiple baselines and chose this one. Two lines does not mean only two runs took place.

I love seeing more and more people start offering tunes for the S65B40. Those are some very big gains across the board!

Not that I doubt Renntech's ability as tuners, but I would have liked to see multiple baseline runs on the dyno. From what I've seen and understand, it takes quite a few runs to get a consistent and proper baseline run on the DynoJet for our cars. Often times, I see the first dyno run being the absolute lowest. Then again, maybe Renntech just renamed their highest baseline pull?

These gains are with a highflow cats and show the first baseline in which as we all know we these cars - is never the highest run. Information is skewed.

These gains are with a highflow cats and show the first baseline in which as we all know we these cars - is never the highest run. Information is skewed.

Exactly why I brought up the point

Originally Posted by m54b25

Well, here's more stock runs.

Thanks for sharing! That definitely helps a lot in showing the great potential of the tune. I hope I am not crossing any boundaries or in any way offending Renntech, but do you have any more baseline pulls?

I am in no way trying to call out Renntech, I just have a big interest and curiosity in finding out a lot information as I learn about different tune options out there for the S65B40. Especially with all this buzz about the latest DME 231E update and them making more power than previous versions, especially those from 2008. I am curious to see what tuners can do on top of that latest update.

Your welcome! Would be glad to tune the BMW latest/greatest revision software. Also, imho there's some room in the table to optimize the S65B40 and/or S85B50. Unlike, compared to some of the newer +12 AMG63 Black series and/or +12 M156 performance package, that are indeed very good tunes from AMG & would require some hardware changes to complement the tune.

Originally Posted by flipm3

Exactly why I brought up the point

Thanks for sharing! That definitely helps a lot in showing the great potential of the tune. I hope I am not crossing any boundaries or in any way offending Renntech, but do you have any more baseline pulls?

I am in no way trying to call out Renntech, I just have a big interest and curiosity in finding out a lot information as I learn about different tune options out there for the S65B40. Especially with all this buzz about the latest DME 231E update and them making more power than previous versions, especially those from 2008. I am curious to see what tuners can do on top of that latest update.

Baselines are from 2008, and latest run was from 2012. Is this the same car? BMW has released a number of software updates since 2008 that could add horsepower on their own. Is the temp noted ambient or IAT? 91 or 93 octane? AFR before/after? Timing targets changed? Min timing changed? Vanos changed?

Honestly, the original dyno tells so little. But this seems to be the norm with the S65 tuners - they don't share much information on what they are doing.

Same car. It runs strong with 79k miles compared to a few 100miles in 2008. Would be nice to test latest E9x software & then add the tune to see a variable difference! Ambient temps it's not the greatest we've seen & I don't think engine IAT would be any better on 93octane. Lambda changes are necessary but min. gain. Timing on E9x are highly tune from BMW M so gains are min. as well. Ah... mod NW (NockenWellen VANOS)!

Well, dyno are tools to find delta improvements. Track results it's where it counts . I've yet to see someone publicly actively tuning E9x M3 share on what they do.

Originally Posted by singletrack

Baselines are from 2008, and latest run was from 2012. Is this the same car? BMW has released a number of software updates since 2008 that could add horsepower on their own. Is the temp noted ambient or IAT? 91 or 93 octane? AFR before/after? Timing targets changed? Min timing changed? Vanos changed?

Honestly, the original dyno tells so little. But this seems to be the norm with the S65 tuners - they don't share much information on what they are doing.

Same car. It runs strong with 79k miles compared to a few 100miles in 2008. Would be nice to test latest E9x software & then add the tune to see a variable difference!

I'm being very picky of course. : )

Ambient temps it's not the greatest we've seen & I don't think engine IAT would be any better on 93octane.

Was not implying IAT would be better on 93 octane; sorry if that was not clear. It's just that, as I'm sure you know, IAT will greatly impact timing which will impact power. Also, from what I understand, the latest BMW software has "relaxed" the knock sensors somewhat per Bren@brentuning if I'm not mistaken. So people are seeing more power just upgrading the OEM software. I was asking if it was 91 or 93 since I would expect that change to have a more significant impact on 91 vs 93 octane.

I agree 100%! Still, hard to find the true delta if there are too many variables. Correction helps of course, but is not bulletproof.

I've yet to see someone publicly actively tuning E9x M3 share on what they do.

I've seen some actual AFR and and timing maps posted, but that is about it. Evolve has stated that they do modify vanos, but do not change timing maps in their latest software. They have also stated that they adjust the ECU torque calculations. But yes, things are still somewhat vague to, presumably, protect everyone's work. : )

Yes, VANOS added overlap it's changed for gains. Full load timing can be left alone, some modified rpm/load areas can be improved, but very minor improvement seen on dyno for a near perfect M stock timing already for pump gas. The closed loop Lambda target it's modded, so replacing O2 as factory recommended service it's always good to keep them in check to be accurate.

BMW newer software are variables fixes that they improve as they progress with their ongoing testing or feedback. Sometimes it might not be related to knock control (Klopfregelung) for gains, rather than other several correction factors. I'm sure we can confirm the relaxed knock, if the mentioned software appears here

Originally Posted by singletrack

I'm being very picky of course. : )

Was not implying IAT would be better on 93 octane; sorry if that was not clear. It's just that, as I'm sure you know, IAT will greatly impact timing which will impact power. Also, from what I understand, the latest BMW software has "relaxed" the knock sensors somewhat per Bren@brentuning if I'm not mistaken. So people are seeing more power just upgrading the OEM software. I was asking if it was 91 or 93 since I would expect that change to have a more significant impact on 91 vs 93 octane.

Sorry, just confirming - you do modify vanos and timing maps?

I agree 100%! Still, hard to find the true delta if there are too many variables. Correction helps of course, but is not bulletproof.

I've seen some actual AFR and and timing maps posted, but that is about it. Evolve has stated that they do modify vanos, but do not change timing maps in their latest software. They have also stated that they adjust the ECU torque calculations. But yes, things are still somewhat vague to, presumably, protect everyone's work. : )

Yes, VANOS added overlap it's changed for gains. Full load timing can be left alone, some modified rpm/load areas can be improved, but very minor improvement seen on dyno for a near perfect M stock timing already for pump gas. The closed loop Lambda target it's modded, so replacing O2 as factory recommended service it's always good to keep them in check to be accurate.

BMW newer software are variables fixes that they improve as they progress with their ongoing testing or feedback. Sometimes it might not be related to knock control (Klopfregelung) for gains, rather than other several correction factors. I'm sure we can confirm the relaxed knock, if the mentioned software appears here